How can I remove everything that is related to TeX Live from my Ubuntu 12.04? I first used the backport packages from
ppa:texlive-backports/ppa and later the manual install via
install-tl-unx.tar.gz. Somehow, everything screwed up, so I want to remove everything to start from scratch.
I want to get a recent TeX Live with Biber support and extended font support, i.e. support for Source Sans Pro.
What to do?